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      1 package com.android.car;
      2 
      3 import android.bluetooth.BluetoothDevice;
      4 import android.bluetooth.BluetoothProfile;
      5 
      6 /**
      7  * Some potentially useful static methods.
      8  */
      9 public class Utils {
     10     static final Boolean DBG = false;
     11 
     12     static String getDeviceDebugInfo(BluetoothDevice device) {
     13         return "(name = " + device.getName() + ", addr = " + device.getAddress() + ")";
     14     }
     15 
     16     static String getProfileName(int profile) {
     17         switch(profile) {
     18             case BluetoothProfile.A2DP_SINK:
     19                 return "A2DP_SINK";
     20             case BluetoothProfile.HEADSET_CLIENT:
     21                 return "HFP";
     22             case BluetoothProfile.PBAP_CLIENT:
     23                 return "PBAP";
     24             case BluetoothProfile.MAP_CLIENT:
     25                 return "MAP";
     26             case BluetoothProfile.AVRCP_CONTROLLER:
     27                 return "AVRCP";
     28             case BluetoothProfile.PAN:
     29                 return "PAN";
     30             default:
     31                 return profile + "";
     32 
     33         }
     34     }
     35 
     36     /**
     37      * An utility class to dump transition events across different car service components.
     38      * The output will be of the form
     39      * <p>
     40      * "Time <svc name>: [optional context information] changed from <from state> to <to state>"
     41      * This can be used in conjunction with the dump() method to dump this information through
     42      * adb shell dumpsys activity service com.android.car
     43      * <p>
     44      * A specific service in CarService can choose to use a circular buffer of N records to keep
     45      * track of the last N transitions.
     46      *
     47      */
     48     public static class TransitionLog {
     49         private String mServiceName; // name of the service or tag
     50         private int mFromState; // old state
     51         private int mToState; // new state
     52         private long mTimestampMs; // System.currentTimeMillis()
     53         private String mExtra; // Additional information as a String
     54 
     55         public TransitionLog(String name, int fromState, int toState, long timestamp,
     56                 String extra) {
     57             this(name, fromState, toState, timestamp);
     58             mExtra = extra;
     59         }
     60 
     61         public TransitionLog(String name, int fromState, int toState, long timeStamp) {
     62             mServiceName = name;
     63             mFromState = fromState;
     64             mToState = toState;
     65             mTimestampMs = timeStamp;
     66         }
     67 
     68         private CharSequence timeToLog(long timestamp) {
     69             return android.text.format.DateFormat.format("MM-dd HH:mm:ss", timestamp);
     70         }
     71 
     72         @Override
     73         public String toString() {
     74             return timeToLog(mTimestampMs) + " " + mServiceName + ": " + (mExtra != null ? mExtra
     75                     : "") + " changed from " + mFromState + " to " + mToState;
     76         }
     77     }
     78 }
     79